Method for introducing a gaseous medium in an enclosure



C. ALLANDER Aug. 26, 1958 METHOD FOR INTRODUCING A GASEOUS MEDIUM IN ANENCLOSURE Filed Feb.

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INVENTOR: CLAES ALLANDER WW ATTYS.

states Patent @fifiee METHOD FOR TNTR'DDUCING A GASEOUS MEDIUM IN ANENCLOSURE Claes Allander, Jonkoping, Sweden, assignor to Aktie holagetSvenska Flaktfahrilren, Stockholm, Sweden Application February 8, 1955,Serial No. 486,920

Claims priority, application Sweden February 8, 1954 Claims. (Cl. 98-40)whereby an eflective mixing of circulating room-air as secondary air ismade possible. This method involves that a mixture of fresh air andcirculated room-air is introduced into the room or enclosure with greatlength .of throw. According to another method medium is supplied througha perforated ceiling. The disadvantage of such supply of medium throughperforated ceilings is that down draft of cold air easily occurs andfurthermore it is diflicult to supply great quantities of air through arelative small area by this method. The present invention brieflyconsists in a combination of air introduction through air supplyelements, where the air is introduced with a relative high velocity andintroduction of a certain quantity of the same medium through one ormore adjacent openings in such a direction that a mixing of these twoparts of the medium occurs. The advantage of this combination is mainlythat great quantities of air can be introduced with a small length ofthrow, whereby the disadvantage of draft is eleminated when supplyingventilating air. Although the supply of ventilating air to a room is animportant field of use the invention is however not limited to such use.

The invention is mainly characterized in that the gaseous medium isintroduced into the enclosure partly through a number of openings in adistributing element arranged at the air supply point and partlythroughone or more openings adjacent to said distributing element, thelastmentioned part of the medium being introduced substantiallyperpendicular to the direction of the first-mentioned part of the mediumand preferably with a low velocity so that a soft introduction of themedium is obtained by the mixing of said two medium parts immediatelyafter that the medium is supplied. The proportion between the quantitiesof said parts of the medium can in accordance with a suitableperformance of the invention be varied.

Another performance of the method according to the invention, whereinthe gaseous medium is introduced at the ceiling or at a wall of theenclosure is characterized in that one part of the medium is introducedinto the enclosure through a number of openings of a grill-likedistributing element and in that the other part of said medium isintroduced preferably through an adjacent elongated slot along theceiling or the wall, the slot having the same extension as said openingsor through a row of openings with corresponding length, the two parts ofthe medium thus being introduced substantially perpendicular to eachother. According to a modification of the method wherein the gaseousmedium is introduced at the Patented Aug. 26, 1958 2 ceiling of theenclosure, one part of the medium is introduced into the enclosuresubstantially parallel to the ceiling through a number of openings in agrill-like distributing element and the other part ,of the mediumthrough perforations in the adjacent part of the ceiling. According tostill another performance of the method the medium introduced throughsaid distributing element is given a fan-shaped diffusion by turning theopenings of a distributing element to a corresponding oblique direction.

The invention will now be more closely described with reference to someexemplifying performances of suitable arrangements. In the accompanyingdrawing Fig. l is a plan view of a distributing element for theintroduction of the medium into an enclosure and Fig. 2 is a crosssection of said element along the line 22 in Fig. 1.

Fig. 3 illustrates a combination of a grill-like distributing elementand perforations in the adjacent part of the ceiling.

Fig. 4 shows an arrangement consisting of a distributing elementarranged just below the ceiling and surrounded by perforated parts ofthe adjacent ceiling area.

Fig. 5 is a cross section of the distributing element along the line 55of Fig. 1.

Referring now to Figs. 1, 2, and 5, the distributing element or grillcomprises a frame ll having side walls 22 and a front plate 23 extendingoutwardly beyond the side Walls 22. The front wall of the frame has anenlarged central opening 24 therein, the side walls of which are spacedinwardly from the side walls 22 of the frame l. A flange 4 extendsinwardly of the side walls 22 in spaced relation to the front wall 23. Afront plate 2, in the present instance of substantial thickness, ismounted in the frame 1 between the flange 4 and the front wall as shownin Figs. 2 and 5. The front plate 2 is mounted for transverse slidingmovement within the frame and is smaller in width than the opening 24 inthe front wall 23. The front plate 2 is provided with a number ofparallel transverse slots 3 for introducing jets of air into anenclosure. As shown in Fig. 2, the reduced width of the front plate 2,when the plate is in its right hand limit position ,as shown in Fig. 2,provides a passageway or longitudinal slot 5 through which air can passinto the enclosure, the passageway 5 being perpendicular to the slots 3.The transverse slots 3 are preferably disposed obliquely as shown inFig. 5 to effect a fan-shaped diffusion of the air jets introduced intothe enclosure through the slots 3. The size of this passageway 5' can bevaried by moving the plate and its position can be fixed for instance bytightening of a screw 8, which freely passes an elongated aperture 7 inthe frame. The direction of the air through the distributing element isillustrated by the arrows A and B, of which A designates the maincurrent of the medium through the opening of the grill plate and B theshunt current through the slot 5. In order to cause an immediate mixingof these medium currents the distributing element is suitably providedwith a deflecting flange 6, giving the medium current through the slot 5a direction substantially perpendicular to the medium current passingthrough the openings of the grill.

In Fig. 3 the designations 11 and 15 stand for one wall and the ceiling,respectively, of the enclosure, into which a gaseous medium, preferablyair is to be introduced in accordance with the invention. The medium issupplied through the duct 12 and is introduced into the room orenclosure partly through an opening 13, arranged in the wall Ill andpartly through a grill or series of openings in the ceiling 15 adjacentto the wall opening 13. This construction provides the same type of airdiffusion as the construction Figs. 1 and 2. The wall opening 13 may beprovided with a standard grill, or as shown in Fig. 3

schematically, with a grill made in accordance with the constructionshown in Figs. 1, 2, and 5.

In Fig. 4, 15a designates the ceiling of an enclosure and 12a stands fora duct for the medium (ventilating air) to be introduced into theenclosure, said duct being arranged above the ceiling. Said ductcommunicates partly through the opening 19 with a distributing means 20which projects downwardly into the enclosure. A portion of the gaseousmedium passes outwardly into the room or enclosure through theperforations 18 arranged in the ceiling adjacent to the distributingmeans 20. The distributing means 20 may either be of circular shape withradial openings 17 or it may consist of a rectangular duct extendingalong the ceiling, in which case the openings 17 are positioned alongthe two vertical sides of the duct. A portion of the gaseous medium isdirected horizontally outward through the opening 17 to mix with themedium passing vertically downward through the opening 18. In the firstcase the distributing means may be provided with slots 5a above theopenings 17 for one part of the medium current and deflecting flanges 6afor the guiding of said medium current in the same manner as isillustrated in Figs. 1 and 2.

What I claim:

1. In a method for introducing a gaseous medium into an enclosure, thesteps which comprise supplying a medium having a given condition to atleast one area of introduction into the enclosure, dividing the mediumsupplied into two portions at each area of introduction, directing oneportion of said medium into the enclosure in one direction in aplurality of jet streams at a relatively high velocity, and interruptingsaid jet streams by directing the second portion of said medium into theenclosure adjacent the entrance of said jet streams in a direction atright angles to said jet streams across said area at a relatively lowervelocity than said jet streams, said second portion being formed as amedium-curtain stream coextensive with the area of introduction tothereby intermix the curtain stream with all of said jet streams andprevent creation of drafts in the enclosure.

2. The method according to claim 1, including the step of varying theratio between the quantities of the medium in the jet streams and thecurtain stream.

3. The method according to claim 1, wherein the said jet streams aredirected horizontally into the enclosure along the ceiling of theenclosure and the curtain stream is directed vertically downward intothe enclosure from an adjacent part of said ceiling.

4. Grill structure for introducing air and like gaseous medium into anenclosure comprising a rectangular frame having an opening therein forpassing said air, a front plate covering said opening, a plurality oftransverse slots in said front plate for introducing jets of the airtherethrough into the enclosure, a longitudinal slot along one edge ofthe frame coextensive with and at right angles to said transverse slots,a deflector mounted adjacent the remote edge of said longitudinal slotextending outwardly from said front plate and overlying said slot todirect the air passing through said longitudinal slot transverselyacross said front plate to intermix with the air introduced through saidtransverse slots, and means in said grill structure to throttle themedium flow through said longitudinal slot.

5. Grill structure according to claim 4 wherein said transverse slotsare disposed obliquely to effect a fanshaped diffusion of said jetsintroduced therethrough.

References Cited in the file of this patent UNITED STATES PATENTS1,890,236 Rookstool Dec. 6, 1932 2,360,343 Hill Oct. 17, 1944 2,392,393Kennedy Jan. 8, 1946 2,424,828 Keep July 29, 1947 FOREIGN PATENTS699,316 Germany Nov. 27, 1940

